/* snd_sdl.c (description) Copyright (C) 1996-1997 Id Software, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to: Free Software Foundation, Inc. 59 Temple Place - Suite 330 Boston, MA 02111-1307, USA */ #ifdef HAVE_CONFIG_H # include "config.h" #endif static __attribute__ ((used)) const char rcsid[] = "$Id$"; #ifdef HAVE_STRING_H # include #endif #ifdef HAVE_STRINGS_H # include #endif #include #include #include #include #include "QF/cmd.h" #include "QF/plugin.h" #include "QF/qargs.h" #include "QF/sys.h" #include "snd_render.h" static dma_t sn; static int snd_inited; static int snd_blocked = 0; static int desired_speed = 11025; static int desired_bits = 16; static plugin_t plugin_info; static plugin_data_t plugin_info_data; static plugin_funcs_t plugin_info_funcs; static general_data_t plugin_info_general_data; static general_funcs_t plugin_info_general_funcs; static snd_output_data_t plugin_info_snd_output_data; static snd_output_funcs_t plugin_info_snd_output_funcs; static void paint_audio (void *unused, Uint8 * stream, int len) { int sampleposbytes, samplesbytes, streamsamples; streamsamples = len / (sn.samplebits / 8); sampleposbytes = sn.samplepos * (sn.samplebits / 8); samplesbytes = sn.samples * (sn.samplebits / 8); sn.samplepos += streamsamples; while (sn.samplepos >= sn.samples) sn.samplepos -= sn.samples; if (sn.samplepos + streamsamples <= sn.samples) memcpy (stream, sn.buffer + sampleposbytes, len); else { memcpy (stream, sn.buffer + sampleposbytes, samplesbytes - sampleposbytes); memcpy (stream + samplesbytes - sampleposbytes, sn.buffer, len - (samplesbytes - sampleposbytes)); } *plugin_info_snd_output_data.soundtime += streamsamples; } static void SNDDMA_Init_Cvars (void) { } static volatile dma_t * SNDDMA_Init (void) { SDL_AudioSpec desired, obtained; snd_inited = 0; if (SDL_Init (SDL_INIT_AUDIO) < 0) { Sys_Printf ("Couldn't initialize SDL AUDIO: %s\n", SDL_GetError ()); return 0; }; /* Set up the desired format */ desired.freq = desired_speed; switch (desired_bits) { case 8: desired.format = AUDIO_U8; break; case 16: if (SDL_BYTEORDER == SDL_BIG_ENDIAN) desired.format = AUDIO_S16MSB; else desired.format = AUDIO_S16LSB; break; default: Sys_Printf ("Unknown number of audio bits: %d\n", desired_bits); return 0; } desired.channels = 2; desired.samples = 1024; desired.callback = paint_audio; /* Open the audio device */ if (SDL_OpenAudio (&desired, &obtained) < 0) { Sys_Printf ("Couldn't open SDL audio: %s\n", SDL_GetError ()); return 0; } /* Make sure we can support the audio format */ switch (obtained.format) { case AUDIO_U8: /* Supported */ break; case AUDIO_S16LSB: case AUDIO_S16MSB: if (((obtained.format == AUDIO_S16LSB) && (SDL_BYTEORDER == SDL_LIL_ENDIAN)) || ((obtained.format == AUDIO_S16MSB) && (SDL_BYTEORDER == SDL_BIG_ENDIAN))) { /* Supported */ break; } /* Unsupported, fall through */ ; default: /* Not supported -- force SDL to do our bidding */ SDL_CloseAudio (); if (SDL_OpenAudio (&desired, NULL) < 0) { Sys_Printf ("Couldn't open SDL audio: %s\n", SDL_GetError ()); return 0; } memcpy (&obtained, &desired, sizeof (desired)); break; } SDL_LockAudio(); SDL_PauseAudio (0); /* Fill the audio DMA information block */ sn.samplebits = (obtained.format & 0xFF); sn.speed = obtained.freq; sn.channels = obtained.channels; sn.samples = obtained.samples * 16; sn.samplepos = 0; sn.submission_chunk = 1; sn.buffer = calloc(sn.samples * (sn.samplebits / 8), 1); if (!sn.buffer) { Sys_Error ("Failed to allocate buffer for sound!"); } snd_inited = 1; return &sn; } static int SNDDMA_GetDMAPos (void) { return sn.samplepos; } static void SNDDMA_Shutdown (void) { if (snd_inited) { SDL_PauseAudio (1); SDL_UnlockAudio (); SDL_CloseAudio (); snd_inited = 0; } } /* SNDDMA_Submit Send sound to device if buffer isn't really the dma buffer */ static void SNDDMA_Submit (void) { if (snd_blocked) return; SDL_UnlockAudio(); SDL_LockAudio(); } static void SNDDMA_BlockSound (void) { ++snd_blocked; } static void SNDDMA_UnblockSound (void) { if (!snd_blocked) return; --snd_blocked; } PLUGIN_INFO(snd_output, sdl) { plugin_info.type = qfp_snd_output; plugin_info.api_version = QFPLUGIN_VERSION; plugin_info.plugin_version = "0.1"; plugin_info.description = "SDL digital output"; plugin_info.copyright = "Copyright (C) 1996-1997 id Software, Inc.\n" "Copyright (C) 1999,2000,2001 contributors of the QuakeForge " "project\n" "Please see the file \"AUTHORS\" for a list of contributors"; plugin_info.functions = &plugin_info_funcs; plugin_info.data = &plugin_info_data; plugin_info_data.general = &plugin_info_general_data; plugin_info_data.input = NULL; plugin_info_data.snd_output = &plugin_info_snd_output_data; plugin_info_funcs.general = &plugin_info_general_funcs; plugin_info_funcs.input = NULL; plugin_info_funcs.snd_output = &plugin_info_snd_output_funcs; plugin_info_general_funcs.p_Init = SNDDMA_Init_Cvars; plugin_info_general_funcs.p_Shutdown = NULL; plugin_info_snd_output_funcs.pS_O_Init = SNDDMA_Init; plugin_info_snd_output_funcs.pS_O_Shutdown = SNDDMA_Shutdown; plugin_info_snd_output_funcs.pS_O_GetDMAPos = SNDDMA_GetDMAPos; plugin_info_snd_output_funcs.pS_O_Submit = SNDDMA_Submit; plugin_info_snd_output_funcs.pS_O_BlockSound = SNDDMA_BlockSound; plugin_info_snd_output_funcs.pS_O_UnblockSound = SNDDMA_UnblockSound; return &plugin_info; }